The Mazarin Bible is usually considered to be the joint work of Gutenberg and Fust. Mr Winter Jones has conjectured that the metal types used in early printing were cut by the goldsmiths, and that Fust's skill, as well as his money, were pressed into Gutenberg's service. But if, as some have thought, Fust provided money only, while Gutenberg was the working partner, then Fust would hardly have been concerned in its actual production until 1455, when he and Gutenberg separated. Even then--supposing the book to have been still unfinished--it is quite possible that Schoeffer did the work. But no one is able to decide the exact parts played by those three associated and most noted printers of Mentz; conjecture alone can allot them. Gutenberg returned to Mentz in 1456, and made a fresh start, aided financially by Dr Conrad Homery. Here again we are confronted with a want of direct evidence, and can point to no books as certainly being the work of Gutenberg. But there are good reasons for believing that under this new arrangement he printed the _Catholicon_, or Latin grammar and dictionary, of John of Genoa; the _Tractatus racionis et conscientiæ_ of Matthæus de Cracovia; _Summa de articulis fidei_ of Aquinas; and an Indulgence of 1461. There is a colophon to the _Catholicon_ which may possibly have been written by Gutenberg, which runs as follows:-- "By the assistance of the Most High, at Whose will the tongues of children become eloquent, and Who often reveals to babes what He hides from the wise, this renowned book, the _Catholicon_, was printed and perfected in the year of the Incarnation 1460, in the beloved city of Mentz (which belongs to the illustrious German nation, whom God has consented to prefer and to raise with such an exalted light of the mind and free grace, above the other nations of the earth), not by means of reed, stile, or pen, but by the admirable proportion, harmony, and connection of the punches and types." A metrical doxology follows. A few other and smaller works have also been believed to have been executed by Gutenberg at this time, but with no certainty. In 1465 Gutenberg was made one of the gentlemen of the court to Adolph II., Count of Nassau and Archbishop of Mentz, and presumably abandoned his printing on acceding to this dignity. In 1467 or 1468 Gutenberg died, and thus ends the meagre list of facts which we have concerning the life and career of the first printer.